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5 results on '"Lima Ângelo M. V."'

1. Intermolecular Alignment Dependence of Ethylene Glycol Flow on the Chemical Nature of the Solid Surface (Borosilicate and SnO2)

Author

Quintella Cristina M., Gonçalves Cristiane C., Pepe Iuri, Lima Ângelo M. V., and Musse Ana P. S.

Subjects
liquid-solid interface, fluorescence depolarization, anisotropy, liquid flow, dynamic surface tension, Chemistry, QD1-999
Abstract

This work studied ethylene glycol (MEG) flowing on two different solid surfaces, borosilicate and thin dioxide (SnO2). Intermolecular alignment, determined as polarization and anisotropy, showed dependence on the solid chemical nature. The ratio between dynamic surface tensions was found 1.09 ± 0.07, being stronger for MEG/borosilicate than for MEG/SnO2. The capillary ratio found was 0.92 ± 0.06, being smaller for MEG/borosilicate. Static contact angle measurements gave lower values for borosilicate than for SnO2. Both polarization and anisotropy maps presented higher values for MEG/SnO2, which can be explained by MEG/borosilicate higher interfacial interaction. The results obtained are compatible with stronger bulk phenomena for MEG/SnO2 and with stronger interfacial phenomena for MEG/borosilicate. This may be due to borosilicate being more electronegative, yielding more efficiently hydrogen bonds with MEG.

Published
2001

2. Um banho termostático de baixo custo (temperatura ambiente até 0ºC)

Author

Quintella, Cristina M., Gonçalves, Cristiane C., Lima, Ângelo M. V., Guimarães, Alexandre K., Santos, José C. dos, and Pepe, Iuri M.

Subjects
thermal bath, thermostatization, instrumentation for chemistry laboratories
Abstract

Thermal baths to decrease ambient temperature are an indispensable tool for most research and teaching laboratories, especially those in tropical or equatorial regions. A simple and inexpensive thermal bath has been developed based on a scratched compressor. It has three possible setups for cooling: sample immersed into the bath, sample flowing through the bath, and cooling liquid flowing in a jacket around the sample. It has been tested for 40 months. The temperature ranges from room temperature to 0 °C, when using water. The repeatability is better than 3% and the precision varies from 0.5% to 2%.

Published
2003

3. Wettability under Imposed Flow as a Function of the Baking Temperatures of a DGEBA Epoxy Resin Used in the Crude Oil Industry

Author

Quintella, Cristina M., primary, Friedrich, Leila A., additional, Musse, Ana Paula S., additional, Lima, Ângelo M. V., additional, Macêdo, Marcelo A., additional, Silva, Ramires M., additional, Pepe, Iuri M., additional, Silva, Eduardo B., additional, Quintella, Heitor M., additional, and Soares, Luiz Carlos S., additional

Published
2007
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